d.root-servers.net has no TXT records.
Question and response
Question
dig d.root-servers.net. TXT
Answer
The response has no answer records.
Authority
root-servers.net. 3600000 SOA a.root-servers.net. nstld.verisign-grs.com. 2026022600 14400 7200 1209600 3600000
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0